Enable remote submix for wifi display.

import android.content.Intent;

import android.content.IntentFilter;

import android.hardware.display.WifiDisplay;

import android.media.AudioManager;

import android.media.RemoteDisplay;

import android.net.NetworkInfo;

import android.net.wifi.p2p.WifiP2pConfig;

    private static final int CONNECT_MAX_RETRIES = 3;

    private static final int CONNECT_RETRY_DELAY_MILLIS = 500;

    // A unique token to identify the remote submix that is managed by Wifi display.

    // It must match what the media server uses when it starts recording the submix

    // for transmission.  We use 0 although the actual value is currently ignored.

    private static final int REMOTE_SUBMIX_ADDRESS = 0;

    private final Context mContext;

    private final Handler mHandler;

    private final Listener mListener;

    private final WifiP2pManager mWifiP2pManager;

    private final Channel mWifiP2pChannel;

    private final AudioManager mAudioManager;

    private boolean mWifiP2pEnabled;

    private boolean mWfdEnabled;

    private boolean mWfdEnabling;

        mWifiP2pManager = (WifiP2pManager)context.getSystemService(Context.WIFI_P2P_SERVICE);

        mWifiP2pChannel = mWifiP2pManager.initialize(context, handler.getLooper(), null);

        mAudioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);

        IntentFilter intentFilter = new IntentFilter();

        intentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);

        intentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);

            Slog.i(TAG, "Stopped listening for RTSP connection on " + mRemoteDisplayInterface

                    + " from Wifi display: " + mConnectedDevice.deviceName);

            if (mRemoteDisplayConnected) {

                mAudioManager.setRemoteSubmixOn(false, REMOTE_SUBMIX_ADDRESS);

            }

            mRemoteDisplay.dispose();

            mRemoteDisplay = null;

            mRemoteDisplayInterface = null;

                        mRemoteDisplayConnected = true;

                        mHandler.removeCallbacks(mRtspTimeout);

                        mAudioManager.setRemoteSubmixOn(true, REMOTE_SUBMIX_ADDRESS);

                        final WifiDisplay display = createWifiDisplay(mConnectedDevice);

                        mHandler.post(new Runnable() {

                            @Override